I am a plastic boat guy, myself, but what you are asking about really sounds like a composite boat to me. Some sort of 17' or longer boat, like a Valley Nordkapp or Avocet.
There are plastic versions of both of these, which you may want to consider, but the description you give really makes it sound like composite is the way to go. You don't need to be that much more careful with composite over plastic. And some of the reason people are less careful with plastic (they are so heavy that they drag rather than carry) is offset by the lighter-weight (carry-able) composite.
The Kayak Wing
Kayak & Canoe Covers
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